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Crystallized Shell?


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My son picked this up a few years ago and I never got around to trying to id it. I'm fairly certain it came from the North Sulphur River, cretaceous. It is very crystallized inside each chamber. The only thoughts I have are that it's a cross section of a gastropod or snail shell?







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Is it sandstone, or has it crossed the line to quartzite?

"There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant

“Try to learn something about everything and everything about something.” - Thomas Henry Huxley

>Paleontology is an evolving science.

>May your wonders never cease!

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the top and bottom (top right pic and bottom left pic) seem to be sand stone. The walls of the inner chambers are hard to make out, because of the crystals.

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